A new study is raising concerns about the effects of cannabis, suggesting it may do more than just impact memory — it could actually change how memories are formed.
Researchers led by Carrie Cuttler at Washington State University found that cannabis use, particularly THC, can significantly disrupt multiple types of memory at once.
In controlled testing, participants who consumed THC were more likely to recall things that never actually happened, a phenomenon known as false memory.
The study showed that cannabis doesn’t just blur recall. It can interfere with everyday memory functions such as remembering conversations, tracking information, or recalling where something came from.
Participants under the influence also struggled with prospective memory, which involves remembering to complete tasks in the future, like attending appointments or taking medication.
One surprising finding was that even moderate doses of THC caused similar levels of memory disruption as higher doses, suggesting the effect may not depend heavily on how much is consumed.
Researchers emphasized that cannabis appeared to affect many different memory systems at once, rather than targeting just one specific type of recall.
While the study focused on short-term effects during intoxication, experts say the findings highlight how cannabis can impact daily decision-making and reliability of memory, especially in situations where accuracy matters.
The results add to growing research showing that cannabis can impair short-term memory and cognitive performance, though long-term effects may vary depending on usage patterns and individual factors.
